Laboratory scale treatability study of industrial waste water Leather chemicals and kraft paper industry

Department of Chemistry and Environment, Heritage Institute of Technology, Anand pur,

Kolkata-700 107, India

Envirocheck, 189 & 190, Rastraguru Avenue, Koltata-700 028, India

E-mail : envcheck@cal2. vsnl. net. in

Manuscript received 15 March 2011, accepted 19 May 2011

Due to industrialization a number of different industries have become interested to invest in our country. Some of the industries are discharging their waste water without treatment to the water bodies causing ecological imbalance in aquatic life as a whole. In this study water samples were collected from two industries, manufacturing leather chemicals and kraft paper. A laboratory scale treatability study was conducted to find out an appropriate treatment procedure to achieve a depletion of pollutants - BOD and COD to a level to meet the standard for discharge to surface water bodies. The treatment procedure was standardized and a physicochemical treatment followed by biological treatment and tertiary treatment was found to be more suitable. The dosing rate of chemicals and retention period of biological degradation were fixed. On the basis of the findings the design criteria of individual units of effluent treatment plant was finalized.